图示：前列腺增生。正常成人男性的前列腺直径约3-4cm，重量可达25克。前列腺细胞数量以及间质都增加了，导致前列腺整体增大，重量估计达70g以上。但由于这种增生是不均一的，而呈现为结节状。这种改变虽然是受性激素调节的，但不是正常的生理性增生，这种病理性增生会影响膀胱的排空。
This is prostatic hyperplasia. The normal adult male prostate is about 3 to 4 cm in diameter and up to 25 gm in weight. The number of prostatic glands, as well as the stroma, has increased in this enlarged prostate seen in transverse section, and as a result, the entire prostate has increased in size, estimated at more than 70 gm. The pattern of increase here is not uniform, but nodular. This increase is in response to hormonal action on the cells, but in this case is not a normal physiologic process, but a pathologic process that could interfere with emptying of the urinary bladder.